Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd59be83c267257c…

MALICIOUS

PDF

76.3 KB Created: 2021-06-06 06:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 23de2b7e05382558c2c80665939445fd SHA-1: dfb29e80e3de11f579b70b36f94f5f063511bf10 SHA-256: dd59be83c267257c58379673a7e02d2e98da4cc8718902641330f13cc3a3e496
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it is designed to lead users to harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/123?utm_term=honorable+mention+award+certificate+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_600a075925508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_605f38ba056bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_604fe92299140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_600ae860155e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6032e163abc0f.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/sejis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_6069372b56804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fda8e90dab28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6054edbc23889.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/0edaa279889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6027cb3754854.pdfIn PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/ziruseloxepebo-fekepix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413976/75834922639.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/whatsapp_messenger_apk_download_for_android_2.3_4.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/6879020128.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144527586/how_to_learn_python_on_freecodecamp.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/be_here_now_ram_dass_used.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144462519/far_cry_apk__obb_download_for_android.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144595713/loriwovisomipa.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144473922/lazesegokuwunife.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/w/file/fetch/144516354/how_to_find_the_original_price_after_percentage_increase.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/f/fivaxiwatewowubodiba.pdfIn PDF document text
    • http://pibadaro.pbworks.com/f/ledibukejivakonijinevulin.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/suzuki_df_140_user_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5316 bytes
SHA-256: 7c1f662372f1a0067e0a57c63f3d7e32b272bb4459c1805c74946c5d1a730761
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10536 bytes
SHA-256: 61012fd22fb376ff835cee9b57c7a4c271f98d98498691c11e8ba90fee2b4817